org.bouncycastle.openpgp.operator.bc.BcPBESecretKeyDecryptorBuilder.java Source code

Introduction

Here is the source code for org.bouncycastle.openpgp.operator.bc.BcPBESecretKeyDecryptorBuilder.java

Source

package org.bouncycastle.openpgp.operator.bc;

import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.bouncycastle.openpgp.operator.PGPDigestCalculatorProvider;

public class BcPBESecretKeyDecryptorBuilder {
    private PGPDigestCalculatorProvider calculatorProvider;

    public BcPBESecretKeyDecryptorBuilder(PGPDigestCalculatorProvider calculatorProvider) {
        this.calculatorProvider = calculatorProvider;
    }

    public PBESecretKeyDecryptor build(char[] passPhrase) {
        return new PBESecretKeyDecryptor(passPhrase, calculatorProvider) {
            public byte[] recoverKeyData(int encAlgorithm, byte[] key, byte[] iv, byte[] keyData, int keyOff,
                    int keyLen) throws PGPException {
                try {
                    BufferedBlockCipher c = BcUtil.createSymmetricKeyWrapper(false,
                            BcImplProvider.createBlockCipher(encAlgorithm), key, iv);

                    byte[] out = new byte[keyLen];
                    int outLen = c.processBytes(keyData, keyOff, keyLen, out, 0);

                    outLen += c.doFinal(out, outLen);

                    return out;
                } catch (InvalidCipherTextException e) {
                    throw new PGPException("decryption failed: " + e.getMessage(), e);
                }
            }
        };
    }
}